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MACHIN ooL. APPLICATION FILED MAR: 16A 191B.

A'l ,3,1 2,2197 Patented Aug.`5,`1919.

islaam.

To all whom it may concern.'

both light and heavy duty purposes'. other object is to provide asupportlng`- j STATES PATENT OFFICE."

CHARLES A; BI'cK-ETT, oFfciNcI-NNATI, omo.

MACHINE-Toon Be it known that I, CHARLES BICK'ETT,

a citizen of the `United States, residing at Cincinnati, in the countyo'f Hamilton and :State of Ohio, havel invented certain new and usefulImprovements in Machine-Tools, of which thefollowing is aspecification.A

My invention relates to improvements in milling machines, gearcuttersand similar tools. One of its objects is to provide anim provedand rigid supporting means for the spindle out bearing hanger. for heavyduty purposes. Another object A1s to provide an l improved andadjustable supporting means adapted 'byv simple adjustments to use lAormeans to rigidly and firmly support the out bearing hanger in alinementwith the main spindle bearings for heavy duty purposes and to providefor a quickly adjustable less rigid support for light duty purj poses.Another object l is to provide for .economies in material and `labor'fofproductionwith improvement-in quality. My invention also comprisescertam detalls of form, combination, and arrangement, allo'f which willbe fully set forth in the description of which: A

Figure 1 is aside elevation '0f the upper portion of a milling machineembodying my Y improvements.

Fig. 2 is an end view of the same. l Fig. 3 is a sectional detail onlineAB-B of Fig. 1.

Fig. 4 is an inside plan of one of 'they clampsupporting bracketsdetached.

Fig. 5 is a jaws detached.

Fig. 6 is a tached.

plan of one of the clamping plan of a clamping nut-de- The. accompanyingdrawings illustrate the preferred embodiment of my invention, in which Arepresents the main frame of a milling machine. B .representsthenspindleV on whlch either rotarycutters orfwork members may bemounted. An adjustablework table of usual construction is contemplatedAto be employed, but is 'not shown inthe illustration. 'llhespindle -isadapted bto be ro tated at different speedsover a wlde range `by meansofcone pulleys D and E and back gear mechanism F and Gr. Any desiredtype of spindle driving mechanism may be ern- Specication of LettersPatent. p

the accompanying drawings,

' Patented Aug. I5, 1919.

' Application led March 16,1918. Serial N ol 222,861.

ployed which provides for a sufficient range 4 of speeds.

Two overarms 15 and 16 are provided, located one above the otherpreferably with their axes in one plane, and also in one plane the mainframe, Each ofl said over-arms may be independently adjustable endwisein its bore in the main frame, but this is not essential tothe carryingout of my inventhe main frame, hence if desired one of said arms, forinstance arm 16 may be lockedagalnst adjustment endwise relative tothemain.- frame by means of a pin or key 14:.

Near each end of the main frame isa cy'- lindrical recess 17 through themain frame from one side` to the-other. On one face of means offaceplates 18 and on the opposite face by means of face plates 19.VA Theplates 19 have each a cylindrically dressed section 2O to-enter andclosely fit the cylindrical guide a collar or integral projection 2l onthe clamping bolt 22. The plate 18 has projections 24 which closely litthe b ore 17 on their eXteriors, andA which receive between them andembracea clamping nut 25 so as to prevent rotation of said nut. The "nut251s threaded to one Yend of the ,clamping bolt 22, and the threaded endof the clamping bolt is journaled and supported in the central bore ofthe plate 18. The face plates 18 and 19 when assembled are held in placeby means of bolts or cap screws 26.

Clamping jaws 27 and 28 are mounted upon the clamping bolts andinterposed between projections 21 and nuts 25 so that rotation of thecl'ampingbolts in one direction by means of their hand levers29 willdraw the clamping jaws .27 and 28 together and cause them to firmly gripeither or both of 'with` and vertically above the spindle. The yvover-arms are mounted in separate `bores in tion, as it is onlydesirable that oneof said over-arms be adjustable endwise relative tothe main frame the recesses 17 are closed by ,80 'bore 17, and a counterrecess to receive 4and a bearing 31 to rotatably support the outer endof the spindle. The hanger'30' is provided With a cylindrical recess 32similar to the recess 17, and face plates 33 and 34simi- 'ier te plates18' and 19, and' with clamping mechanism such 'as heretofore describedfor 'ciamping the over-arms to the main frame. 'Said clamping mechanismserves to clamp I thefhanger 30 to any desired position of adjustmentrelative to one or both of the over- .arms

Invpractice the recesses 17 and 32 are first I faced and bored and theface plates and lclamping .mechanism assembled invposition and theclamping jaws blocked rigidly in position, after which the recesses orbores to .receive the over-arms are bored, including the clamping facesof the jaws. By providing vduplicate clamping mechanism on the mainframe and hanger to clamp the overarms With firmness and accuracy, aconsiderable economy in construction is eii'ected.

For heavy duty work both over-armsare employed to support the hanger 30,the hanger is self centering, anda trussed effect and great rigidityin'the support of said hanger are attained. -For light duty Work Wherefrequent changes in the adjustment of the hanger'30 are desired, orWhere it is desired to adjust the hanger spindle bearing out ofengagement with the spindle, one 4 of the over-arms, say for instancethe upper one is adjusted endwise relative to the main frame f and outof engagement with the hanger 30, 35

thereby leaving the hanger 30'supported by and adjustable relative toone over-arm only. /Vhen a single over-arm is `employed Having describedmy invention, what I" claim is:

1. A machine tool comprising a main frame, a rotary spindle, a pluralityof overarms mounted upon said main frame with `their aXes .insubstantially one plane with the spindle axis, one of said over-armsbeing adjustable endwiserelative to the main frame, a spindle out,bearing hanger adjustably mounted upon said over-arms, means to rigidlyclamp said respective over- -arms to the main frame, and means torigidly elamp said hanger to the respective over-arms.

2. A machine tool comprising a main frame, a rotary spindle, a pluralityof overarms mounted upon said main frame, the axis of one of saidover-arms heilig in a vertical plane with the spindle axis, and theVother over-arm heilig adjustable endwise relative to said main frame, aspindle out bearing hanger adapted to beI adjustably mounted upon one orboth of said over-arms, means to clamp said over arms respectively tothe main frame, and means to clamp said hanger to said respectiveover-arms,

3. A machine tool comprising a main frame, a rotary spindle, a pluralityot overarms mounted upon said main frame with their axes insubstantially one plane with the axis of said spindle, one of saidoverarms being adjustable endwise relative to the main frame, a spindleont bearing hanger adapted to be adjustably supported upon one or bothof said over-arms, and clamping means common to both 0i saidroif'er-arms to rigidly clamp the respective over-arms to said mainframe.

el. A machine tool comprising a main frame, a rotary spindle a pluralityof overarms mounted upon said main vtrame with their axes insubstantially one plane with the axis ot' said spindle, one o saidoverarms being adjustable endwise relative to the main frame, a spindleout hearing hanger adapted to be adjustably supported upon one or bothof said over-arms, a transverse recess in the main frame opposite saidover-arms, and clamping means detachably mounted in said transverserecess to rigidly clamp the respective over-arms to said main frame.

5. A machine tool con'iprising a main frame, a rotary spindle,'aplurality of overarms rigidly supported upon and relative to said mainframe with their axes in substantially one plane with'the spindle. axis,a spindle out bearing hanger adjustably mounted and supported upon saidoverarms, and m`eans to rigidly clamp said out bearing hanger to therespective over-arms.

In testimony whereof I have ailixed my signature in the presence of twowitnesses.

' C. iV. MILES,

W. THORNTON BoGEn'r.

